public FieldableEntityInterface::validate()
Validates the currently set values.
\Drupal\Core\Entity\EntityConstraintViolationListInterface A list of constraint violations. If the list is empty, validation succeeded.
public function validate();
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Entity!FieldableEntityInterface.php/function/FieldableEntityInterface::validate/8.1.x